Penjelasan:

Should digunakan untuk memberikan saran atau nasihat terhadap sesuatu hal atau seseorang.

Should have digunakan untuk menyatakan sebuah keharusan yang terjadi di waktu lampau dan tidak terlaksana.

Should be adalah a modal verb yang digunakan untuk menunjukkan kewajiban atau memberikan izin.

Jawaban:

1. Look at he vase. It's broken into pieces now. You should have been careful. It was an expensive Chinese vase.

2. You should consult a dictionary if you don't understand the meaning.

3. If you had told me about your problem, I would have been glad to help you. You should not give up easily.

4. You should study math now. Tomorrow you will have a test.

5. I didn't order fried rice for my lunch. They should have gave me fried noodles.

6. You should clean your room now. It is very dirty.

7. He made an impolite statement. As a student, he should have not said such a thing.

8. He should consult a dentist for his bad tooth.

9. The man is coughing a lot. He should not smoke so much.

10. Mr. Lancaster is overweight. He should change his healthy life style such as preventing to consume junk food and having more exercises.